.App {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-top: 50px;
}

.image-container {
    border: 1px solid #ccc;
    border-radius: 8px;
    position: relative; /* 进度条定位 */
}

.progress-bar {
    position: absolute;
    bottom: 0;
    left: 0;
    height: 5px;
    background-color: rgba(255, 0, 0, 0.5);
}